Morphophysical pedotransfer functions for groundwater pollution by nitrate leaching in Central Chile

Fuentes, I.; Casanova, M; Seguel, O.; Nájera F.; Salazar, O

Abstract

Nitrate leaching (NL) is a major concern in agriculture due to its impact on human health and ecosystems. Solute movement through soil is governed by various hydraulic and physical properties that determine water flow. To study such relationships, a pedotransfer function of groundwater pollution was developed in two alluvial irrigated soils under long-term pig slurry applications. Two basins of central Chile, San Pedro (Typic Xerochrepts) and Pichidegua Xerofluvents) were selected, where maize (Zea mays L.) was grown in spring-summer, while during autumn-winter period a ryegrass-barley-oat mixed crop was established in San Pedro and a fallow management applied in Pichidegua. Soils in cultivated and control sites were characterized in physical and hydraulic terms. Nitrogen and water budgets were determined measuring periodically (biweekly) N concentration (N-NO3- and N-NH4+) and monitoring water contents in soil profiles, respectively. Dye tracer tests were performed with brilliant blue (BB) dye and the staining patterns analyzed. To contrast the effect of slurry additions over soil physical properties and over NL, t-Student tests were performed. Some accurate pollution groundwater NL pedotransfer functions were obtained calculated through least square fit models and artificial neural networks. Textural porosity, mean diameter variation, slow drainage porosity, air conductivity at 33 kPa water tension and N-NO3- concentrations were directly related to NL. In terms of preferential flow analysis, stained path width > 200 mm was inversely associated to NL. Finally, dye tracer tests provided a better understanding of the characteristics and pattern of water/solute movement through soil to groundwater.

Más información

Título según WOS: Morphophysical pedotransfer functions for groundwater pollution by nitrate leaching in Central Chile
Título según SCOPUS: Morphophysical pedotransfer functions for groundwater pollution by nitrate leaching in central Chile
Título según SCIELO: Morphophysical pedotransfer functions for groundwater pollution by nitrate leaching in Central Chile
Título de la Revista: CHILEAN JOURNAL OF AGRICULTURAL RESEARCH
Volumen: 74
Número: 3
Editorial: Instituto de Investigaciones Agropecuarias, INIA
Fecha de publicación: 2014
Página de inicio: 340
Página final: 348
Idioma: English
DOI:

10.4067/S0718-58392014000300013

Notas: ISI, SCIELO, SCOPUS